Tatra, India - All Terrain Vehicles for Indian Armed Forces
Lpd 25
1.
2. INTRODUCTION
• USS Somerset (LPD-25), a San Antonio-class amphibious transport dock, is the
fifth ship of the United States Navy of that name; in this case in honor of
Somerset County, Pennsylvania.
• The San Antonio Class landing platform dock is the latest class of amphibious
force ship for the United States Navy.
• The mission of the San Antonio Class is to transport the US Marine Corps
'mobility triad' - that is, advanced amphibious assault vehicles (AAAVs), air-
cushioned landing craft (LCAC) and the MV-22 Osprey tiltrotor aircraft - to
trouble spots around the world.
3.
4. DESIGN
• The ship is constructed from steel and designed to minimise radar cross section.
• Enhanced survivability features include improved fragmentation and nuclear blast protection and
shock-hardened structure.
• Automation and integration of systems has enabled a significant reduction in crew, projected to be
361.
• The ship provides three vehicle decks of 25,402ft² and two cargo holds, with 25,548ft³ for bulk
cargo and ammunition magazines in addition to the 1,234m³ for cargo fuel.
• Accommodation is provided for two LCAC (landing craft air cushioned), 700 troops and 14 new
AAAVs.
• The ship's advanced enclosed mast / sensor (AEM/S) system consists of two large eight-sided
structures, which house the radar and communications antennae with a hybrid frequency-
selective surface.
5.
6. SELF DEFENSE
San Antonio is one of the classes of vessels planned to receive the SSDS (ship self-
defence system) mk2 being developed by Raytheon for the US Navy.
SSDS will be an integration of all the ship's self-defence systems and will include
a multifunction radar, advanced integrated electronic warfare system and
infrared search and track system (IRST).
SSDS is also to be fitted to the US Navy projected new carriers (CVN 76) and
destroyers (DD-X).
The ship is equipped with a fibre-optic shipboard wide area network (SWAN) from
Raytheon, which connects ship systems, sensors and combat systems to the ship's
command consoles.
7.
8. COUNTERMEASURS
• The ship is equipped with the AN/SLQ-25A Nixie towed decoy system, from Argon ST of Fairfax,
Virginia, and the mk53 Nulka decoy launching system, developed by the Australian Defence
Science and Technology Organisation in Canberra and Lockheed Martin Sippican in
Massachusetts.
• Nulka is a hovering rocket system, which deflects incoming missiles away from the ship.
• The Raytheon AN/SLQ-32A (V) 2 ESM (electronic support measures) system is a detection and
jamming system which provides surveillance, warning and electronic countermeasures against
missile attack.
• LPD 22 and later vessels is fitted with the advanced integrated electronic warfare system
(AIEWS).
9.
10. SPECIFICATIONS
Displacement: 25,000 tons full
Length: 208.5 m (684 ft)
Beam: 31.9 m (105 ft) extreme,
Draft: 7 m (23 ft)
Speed: 22 knots (41 km/h)
Capacity: 699 (66 officers, 633 enlisted); surge to 800 total.
11.
12. PROPULSION
• A new high-power 'low-drag' propeller hub design provides improved propeller
efficiency.
• The ship's electrical power is provided by five 2,500kW Caterpillar ship service
diesel generators (SSDG), with self-cleaning strainers and filters and electric
pumps.
• Seven 200t York air-conditioning units are fitted for cooling of systems and
habitation.
• The ship auxiliary systems are all electric, including electric heating, electric
water heaters and a 72,000gpd reverse osmosis water-generating plant.
